Compound leaching behavior and regularity of ionic rare earth ore

Ammonium sulfate in situ leaching process is the most widely used extraction technology for ionic rare earth (RE) ores. Although the leaching process is simple, the leaching rate is satisfactory; moreover, the leaching solution has high impurities, serious ammonia pollution, and other problems. The leaching rate and leaching efficiency using a single ammonia-free leaching agent are low, particularly for low-grade complex ores. In this study, a leaching experiment and kinetic analysis of a combined leaching agent for an ionic RE ore with low grade and high impurity content were carried out.